object CollectionOpsDemo {
  def main(args: Array[String]): Unit = {
    val clubs = List(
      ("编程社", 35),
      ("文学社", 28),
      ("篮球社", 42),
      ("话剧社", 25)
    )

    val activeClubs = clubs.filter { case (_,count) => count >= 30}

    val clubFormats = activeClubs.map { case (name,count) =>
      s"$name($count 人)"
    }
    println("活跃社团：")
    clubFormats.foreach(println)
  }
}
//11.1113【动手练习 4】：筛选活跃社团并转换格式